MRS HOLMES (TESTS) Flashcards
What is the purpose of a sign test?
The purpose is to test the null hyposthesis, which states that there will be no effect.
What is a type one error?
That we rejected the null hypothesis when we shouldn’t have, when we believe there is a difference in our results when there is infact not.
What is a type two error?
It is when we accept the null hypothesis when we should have rejected it, we believed there was no difference in our scores when infact there was.
What is a one tailed hypothesis?
It means that there will be a change in one direction eg we expect their to be an improvement in symptoms.
What is a two tailed hypothesis?
It means that we are looking for a change in either direction eg and improvement or a worsening of symptoms.
What would the conditions need to be to accept the null hypothesis?
The lowest difference must be less than the critical value.
What would the conditions need to be to accept the null hypothesis?
The lowest difference must be equal to or greater than the critical value.
What is one disadvantage of a sign test?
Magnitude, as it only takes into account that there is a difference no hoe big the difference is.
What are the factors affecting the choice of statistical test?
Experimental designs, levels of measurement (types of data used)
What are the three types of data?
Nominal, interval and ordinal.
Explain nominal data?
Data that is split into categories, measurement is by counting frequency of each category.
Explain what interval data is?
It includes a scale that has equally spaced data eg temperature.
Explain what ordinal data is?
Data that is ordered or ranked, distance between data may not be equal.
What types of data can the sign test be used for?
nominal or ordinal.
